SignalsMVVM/SignalsMVVM/HelperClasses/PropertyChanged.cs

using System;
using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace SignalsMVVM.HelperClasses
{
    [Serializable]
    public class PropertyChangedClass : INotifyPropertyChanged
    {
        [field: NonSerialized]
        public virtual event PropertyChangedEventHandler PropertyChanged;

        public virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        public virtual void OnPropertyChanged(params string[] propertyNames)
        {
            foreach (var property in propertyNames)
                OnPropertyChanged(property);
        }
    }
}